Deerns Consulting Engineers Green Data Center Solutions PUE 1.26

1. Deerns Green Datacenters
DEERNS BRINGS CONCEPTS TO LIFE

2. Deerns Green Datacenters
Deerns designs a breakthrough
datacenter with a PUE of 1.26
The project combines state of the art technology, innovative concepts and top-end datacenter performance,
and Gartner reviews the datacenter as ‘Best in Class’. However, Deerns has already designed the next generation
datacenter with a PUE of 1.15, or less.
A leading financial services provider relied on Deerns to design The result is astonishing: The datacenter has a PUE of 1.26,
its twin datacenters. The development is characterized by the with 2.0 being the existing average and 1.5 being the current
combination of a TIER III+ requirement, power density of 3,500 best practice as used by the industry in the Netherlands.
W/m2 (325 W/sqf) and a strong focus on energy efficiency and This generates a huge saving on operational expenditures with
sustainability. Deerns successfully integrated these, leading to a the reduction in energy costs alone accounting yearly for
22 MVA datacenter that Gartner reviewed as “best in class” and approximately 5,000,000 Euro. The additional investments
“does not identify substantial improvement opportunities”. hence pay for themselves in less then a year.
Given the requirements, the design process was a constant Next Generation Green Datacenter
search for synergy, or at least balancing, between greening With a PUE as low as 1.26, the conventional cooling concept
the datacenter and top-end datacenter performance. The most has been stretched to its limit in terms of energy efficiency.
significant energy consumption measures incorporated in the Thus, the next step is to rethink the cooling needs of a datacenter
design are: and how to best satisfy those needs. With this goal in mind,
• highly efficient hot and cold aisle separation Deerns’ datacenter specialists have developed the GC-DC©
• application of cold/heat storage to enlarge the use of concept (Green Cooling for DataCenters), an innovative and
free cooling intelligent new combination of existing, proven technologies.
• collection of rainwater and re-use for the datacenter It is, however, a different and especially much more efficient way
cooling towers of ‘getting the heat outside’.
• governing of the datacenter by “lights out” principle, which
will reduce energy consumption of lighting and other Due to the much more direct transfer of the heat developed in
ancillary systems the computer racks to the outdoor air, free cooling can be used
• re-using of heat from datacenter for heating of office complex for a much greater part of the year. When the outdoor temperature
• green roof to minimize solar gain through roof. becomes too high (greater than ca. 21°C / 70°F 1), the system is
aided by a compression cooling unit located outside the
computer room. The overall system is built in modular compart-
ments, ‘cooling cells’, which are totally independent of one
another, so full cooling system failures are no longer possible
and no water-bearing systems for cooling are located in the
computer room: better availability and reliability through
simplicity. Because of the modular nature of the system,
investment costs for the entire cooling infrastructure
can be postponed in line with the growth of
energy demand during the operational
phase: pay-as-you-grow.
Figure 1: Storing the over capacity of free cooling during winter
or nights, significantly increases the use of free cooling and so
reduces the energy consumption of the datacenter
1 Assuming a cold aisle temperature of 25 °C / 77 °F

3. Deerns Green Datacenters
associated benefits from a social and
environmental perspective. The improved
phasing of the investment is a valuable
asset, especially given the present
uncertainties with project
finance and sales projections.
Basically, GC-DC© makes a
“greener datacenter” the
best value proposition
for any datacenter
host.
Table 1: Financial information on the GC-DC© concept
In summary, the GC-DC© concept features:
• a PUE of 1.15 and 100% free cooling up to 21°C / 70°F 1;
• improved reliability and availability, no possibilities for total
cooling system failure;
• a completely modular cooling system, for improved
phasing of the investment;
• a simpler system with easier maintenance and
operation.
Thus, a company that operates a green
datacenter based on the GC-DC©
concept has a major competitive
advantage due to lower
operational expenditures,
even without taking into
consideration the
Conclusion
In recent years, a reduction of about 60% of cooling
energy consumption has been achieved by Deerns
through tuning the system design with respect to energy
consumption and by incorporating add-on features as
an aquifer for increased energy efficiency. Today, a
reduction of 80% of cooling energy consumption is
possible with the Deerns’ GC-DC© concept. For
tomorrow, Deerns is already developing the next step…

4. Deerns Green Datacenters
Three Steps to Perfectly Green
Tuning Green through Total Cost of
Ownership:
All Deerns publications are printed on FSC-certified paper
1 System for Free Cooling / Minimal Energy
Consumption
2 Components for Minimal Energy Consumption
1
PUE 1.5
Improve Greenness through ‘Add-ons’:
1 Using Cyclic Nature of Outside Air Temperatures
2 Aquifer Storage or Surface Water
2
PUE 1.26
Perfectly Green Cooling for
Datacenters:
1 Direct Free Air-to-Air Cooling
2 Innovative Combination of Proven Technologies
3 Full Modular Design
3
PUE 1.15
Deerns has developed datacenters for:
- Universities
- Financial enterprises
- Telecom enterprises
- Hospitals
Deerns consulting engineers
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